and they asked him the questions without mirandaizing him. so the public safety exception is domestic in nature. so it's completely unnecessary to call him an enemy combatant in the first place. >> they had a lot of guns, and this is part of the investigation. how do two brothers in cambridge, mass, get ahold of all of this weaponry, and create these bombs? now low-level, low-tech bombs, be that they were. can they do that all with online inspiration and help? or do they have to have outside help, do you think? >> that's an excellent question. i'm sure in the coming days and weeks, law enforcement, the press will uncover virtually every aspect of the lives of these individuals, including the answer to that question. i do know that it is relatively and probably shockingly easy to assemble the components to make a bomb from things you can obtain in the united states. and there are terrorist organizations overseas that have instructions online for how to do that. and so it's something that we ought to look carefully at from the law enforcement p